Charging control method and device, charging system and storage medium

Abstract

The invention discloses a charging control method and device, a charging system and a storage medium. The charging control method comprises the following steps: determining respective power supply capability information of an energy storage module and a direct current conversion module in a storage and charging integrated device and charging demand information of to-be-charged equipment; determining the working state of the DC conversion module according to the respective power supply capability information of the energy storage module and the DC conversion module and the charging demand information of the to-be-charged device; controlling a charging module in the storage and charging integrated device to charge to-be-charged equipment according to the working state of the direct current conversion module; the storage and charging integrated device comprises an energy storage module, a direct current conversion module and a charging module, the direct current conversion module is configured to provide input external power for the charging module, and the direct current conversion module is connected with the energy storage module in series, so that the charging module can provide required charging power for to-be-charged equipment. Therefore, the application range of the storage and charging integrated device is expanded, and the charging efficiency is improved.

Description

[0001] Division Case Explanation

[0002] This application is a divisional application of a patent application with an application date of November 18, 2024, an application number of 202411642232.7, and an invention title of "Charging Control Method, Device, Charging System, and Storage Medium". Technical Field

[0003] This application relates to the field of charging technologies, and in particular, to a charging control method, device, charging system, and storage medium. Background Art

[0004] Currently, with the rapid growth of the new energy vehicle market, the construction of charging infrastructure has become particularly important. Among numerous charging solutions, the integrated energy storage and charging device, as a device integrating an energy storage system and a charging function, has become the first choice for many charging stations.

[0005] The integrated energy storage and charging device can charge new energy vehicles through the internal energy storage battery, but the output voltage of the energy storage battery is fixed, and it is difficult for its output voltage to adapt to the charging voltages of various new energy vehicles, reducing the charging efficiency. Summary of the Invention

[0006] This application provides a charging control method, device, charging system, and storage medium, which can enable the integrated energy storage and charging device to achieve voltage adaptation with multiple devices to be charged, thereby expanding the applicable range of the integrated energy storage and charging device and improving the charging efficiency.

[0007] The technical solution of this application is implemented as follows:

[0008] In a first aspect, an embodiment of this application provides a charging control method, which includes:

[0009] Determine the respective power supply capacity information of the energy storage module and the DC conversion module in the integrated energy storage and charging device and the charging requirement information of the device to be charged;

[0010] According to the respective power supply capacity information of the energy storage module and the DC conversion module and the charging requirement information of the device to be charged, determine the working state of the DC conversion module; wherein, the working state includes a positive polarity working state and a reverse polarity working state;

[0011] According to the working state of the DC conversion module, control the charging module in the integrated energy storage and charging device to charge the device to be charged;

[0012] Wherein, the integrated energy storage and charging device includes an energy storage module, a DC conversion module, and a charging module. The DC conversion module is configured to provide the input external power to the charging module, and the DC conversion module is connected in series with the energy storage module so that the charging module can provide the required charging power to the device to be charged.

[0013] Through the above technical means, according to the power supply capacity information of the energy storage module and the DC conversion module respectively, and the charging requirement information of the device to be charged, the working state of the DC conversion module is determined, so as to control the charging module to charge the device to be charged according to the positive-polarity working state or the reverse-polarity working state of the DC conversion module. In this way, according to the working state of the DC conversion module, the charging power output by the DC conversion module and the charging power provided by the energy storage module are jointly provided to the charging module, so that the charging power output by the charging module is wider than the input range of the external power, and the flexibility of the charging power output by the charging module can be improved, so that the range of the charging power is larger, so as to be able to achieve voltage adaptation with a variety of devices to be charged, expand the applicable range of the integrated energy storage and charging device, and improve the charging efficiency.

[0014] In some embodiments, determining the working state of the DC conversion module according to the power supply capacity information of the energy storage module and the DC conversion module respectively, and the charging requirement information of the device to be charged includes: providing a first charging power to the charging module according to the power supply capacity information of the DC conversion module; providing a second charging power to the charging module according to the power supply capacity information of the energy storage module; and determining the working state of the DC conversion module according to the first charging power, the second charging power, and the charging requirement information of the device to be charged.

[0015] Through the above technical means, according to the working state of the DC conversion module, the charging power output by the DC conversion module and the charging power provided by the energy storage module are jointly provided to the charging module, so that the charging power output by the charging module is wider than the input range of the external power, and the flexibility of the charging power output by the charging module can be improved, so as to be able to achieve voltage adaptation with a variety of devices to be charged, and further improve the charging efficiency.

[0016] In some embodiments, controlling the charging module in the integrated energy storage and charging device to charge the device to be charged according to the working state of the DC conversion module includes: when the DC conversion module is in the positive-polarity working state, providing the first charging power output by the DC conversion module and the second charging power output by the energy storage module to the charging module, and charging the device to be charged with the third charging power output by the charging module; or when the DC conversion module is in the reverse-polarity working state, feeding back the first charging power output by the DC conversion module to the energy storage module, providing the fourth charging power output by the energy storage module to the charging module, and charging the device to be charged with the fifth charging power output by the charging module.

[0017] Through the above technical means, by the working state of the DC conversion module, the first charging power provided by the DC conversion module and the second charging power provided by the energy storage module are used to charge the device to be charged through the charging module in a superimposed or offset manner, so that voltage adaptation can be achieved with a variety of devices to be charged, expanding the applicable range of the integrated energy storage and charging device and improving the charging efficiency.

[0018] In some embodiments, the integrated energy storage and charging device further includes a first switch and a second switch, and the charging control method further includes: when the DC conversion module is in the positive-polarity working state, in response to a first control signal sent by the control module, controlling the first switch and the second switch to be in the off state; when the DC conversion module is in the reverse-polarity working state, in response to a second control signal sent by the control module, controlling the first switch and the second switch to be in the on state; wherein, the first switch is connected in series between the first input end of the DC conversion module and the first output end of the energy storage module, and the second switch is connected in series between the second input end of the DC conversion module and the second output end of the energy storage module.

[0019] Through the above technical means, by controlling the on and off states of the first switch and the second switch to match the working state of the DC conversion module, the first charging power provided by the DC conversion module and the second charging power provided by the energy storage module are used to charge the device to be charged through the charging module in a superimposed or offset manner, which can improve the flexibility of the charging power output by the charging module, make the range of the charging power larger, so that voltage adaptation can be achieved with a variety of devices to be charged, expand the applicable range of the integrated energy storage and charging device, and improve the charging efficiency.

[0020] Through the above technical means, when it is detected that the integrated energy storage and charging device establishes a communication connection with the device to be charged, the charging control method further includes: according to the charging demand information of the device to be charged, determining whether the device to be charged has a vehicle-to-grid (V2G) demand; when the device to be charged has a V2G demand, in response to the V2G demand of the device to be charged, controlling the integrated energy storage and charging device to enter a first working mode; wherein, the first working mode is used to control the device to be charged to feed back electric energy to the external power grid.

[0021] Through the above technical means, when it is detected that the integrated energy storage and charging device establishes a communication connection with the device to be charged, if it is determined according to the charging demand information of the device to be charged that the device to be charged has a V2G demand, at this time, the device to be charged can be controlled to feed back electric energy to the external power grid, which can play a role in peak shaving and valley filling for the external power grid, and further improve the utilization rate of electric energy.

[0022] In some embodiments, the charging control method further includes: when the device to be charged does not have V2G requirements, determining whether the energy storage module meets a first preset condition according to the power supply energy information of the energy storage module; when the energy storage module meets the first preset condition, controlling the integrated energy storage and charging device to enter a second working mode; wherein, the second working mode is used to control the external power and the energy storage module to jointly charge the device to be charged; when the energy storage module does not meet the first preset condition, controlling the integrated energy storage and charging device to enter a third working mode; wherein, the third working mode is used to control the external power to charge the device to be charged.

[0023] By the above technical means, if it is determined according to the charging demand information of the device to be charged that the device to be charged does not have V2G requirements, at this time, it can be judged whether the energy storage module meets the first preset condition, that is, whether the power of the energy storage module is sufficient, and whether to jointly supply power to the device to be charged with external power according to the actual situation of the energy storage module, so as to avoid causing over-discharge of the energy storage module and triggering safety problems, thereby improving charging safety; moreover, based on the small power provided by the external power, high-power output of the integrated energy storage and charging device can be realized, so that the cost of the integrated energy storage and charging device can be reduced and the charging speed of the integrated energy storage and charging device can be increased.

[0024] In some embodiments, the integrated energy storage and charging device further includes a third switch and a fourth switch, and the charging control method further includes: when the integrated energy storage and charging device is in the first working mode, in response to a third control signal sent by the control module, controlling the first switch and the fourth switch to be in a conducting state and the second switch and the third switch to be in a non-conducting state; when the integrated energy storage and charging device is in the second working mode, in response to a fourth control signal sent by the control module, controlling the third switch to be in a conducting state and the first switch, the second switch and the fourth switch to be in a non-conducting state; when the integrated energy storage and charging device is in the third working mode, in response to a fifth control signal sent by the control module, controlling the first switch and the fourth switch to be in a conducting state and the second switch and the third switch to be in a non-conducting state; wherein, the third switch is connected in series between the first output end of the DC conversion module and the second output end of the energy storage module, and the fourth switch is connected in series between the second input end of the DC conversion module and the second input end of the charging module.

[0025] By the above technical means, by controlling the conducting state and the non-conducting state of the first switch, the second switch, the third switch and the fourth switch to match the working mode of the integrated energy storage and charging device, charging can be carried out according to the actual situations of the external power, the integrated energy storage and charging device and the device to be charged, and the flexibility of energy storage and charging of the integrated energy storage and charging device is improved.

[0026] In some embodiments, when it is detected that the charging and energy storage integrated device fails to establish a communication connection with the device to be charged, the charging control method further includes: when it is determined that the power supply load of the external power is greater than a preset load threshold, controlling the charging and energy storage integrated device to enter the fourth working mode; wherein, the fourth working mode is used to control the energy storage module to feedback electric energy to the external power.

[0027] By the above technical means, when it is detected that the charging and energy storage integrated device fails to establish a communication connection with the device to be charged, if the power supply load of the external power is greater than the preset load threshold, at this time, the energy storage module can be controlled to feedback electric energy to the external power, so as to achieve the electric energy balance between the energy storage module and the external power, play a role in peak shaving and valley filling for the external power, and further improve the utilization rate of electric energy.

[0028] In some embodiments, the charging and energy storage integrated device further includes a fifth switch and a sixth switch, and the charging control method further includes: when the charging and energy storage integrated device is in the fourth working mode, in response to a sixth control signal sent by the control module, controlling the first switch and the second switch to be in the on state and the third switch, the fourth switch, the fifth switch and the sixth switch to be in the off state; wherein, the fifth switch is connected in series between the second output end of the DC conversion module and the second input end of the charging module, and the sixth switch is connected in series between the first output end of the energy storage module and the first input end of the charging module.

[0029] By the above technical means, by controlling the first switch and the second switch to be in the on state and controlling the third switch, the fourth switch, the fifth switch and the sixth switch to be in the off state, so as to match the fourth working mode of the charging and energy storage integrated device, the charging selection can be made according to the actual situation of the external power and the charging and energy storage integrated device, improving the flexibility of charging; it can also turn off the switch when charging is not required, reducing energy waste.

[0030] In some embodiments, when it is detected that the charging and energy storage integrated device fails to establish a communication connection with the device to be charged, the charging control method further includes: according to the power supply capacity information of the energy storage module, determining whether the energy storage module meets a second preset condition; when the energy storage module does not meet the second preset condition, controlling the charging and energy storage integrated device to enter the fifth working mode; wherein, the fifth working mode is used to control the external power to charge the energy storage module.

[0031] By the above technical means, when it is detected that the charging and energy storage integrated device fails to establish a communication connection with the device to be charged, if it is determined according to the power supply energy information of the energy storage module that the energy storage module does not meet the preset second preset condition, that is, the power of the energy storage module is low, at this time, the external power can be controlled to charge the energy storage module, which can store more electric energy for the energy storage module and improve the utilization rate of electric energy.

[0032] In some embodiments, the charging control method further includes: when the integrated energy storage and charging device is in the fifth working mode, in response to the seventh control signal sent by the control module, controlling the first switch and the second switch to be in the on state and the third switch, the fourth switch, the fifth switch, and the sixth switch to be in the off state.

[0033] By the above technical means, by controlling the first switch and the second switch to be in the on state and controlling the third switch, the fourth switch, the fifth switch, and the sixth switch to be in the off state to match the fifth working mode of the integrated energy storage and charging device, the charging selection can be made according to the external power and the actual situation of the integrated energy storage and charging device, improving the flexibility of charging; and it can also turn off the switch when charging is not required, reducing energy waste.

[0034] In some embodiments, the charging control method further includes: when it is detected that the working mode of the integrated energy storage and charging device meets the preset mode stop condition, or the integrated energy storage and charging device meets the charging cut-off condition, stopping the power flow between the energy storage module, the device to be charged, and the external power.

[0035] By the above technical means, when it is detected that the working mode of the integrated energy storage and charging device meets the preset mode stop condition, or the integrated energy storage and charging device meets the charging cut-off condition, that is, there is a fault in the energy storage module or the device to be charged, etc., at this time, the power flow between the energy storage module, the device to be charged, and the external power is stopped, thereby improving the charging safety.

[0036] In a second aspect, an embodiment of the present application provides a charging control device, which includes a determination unit and a charging unit, where:

[0037] The determination unit is configured to determine the respective power supply capacity information of the energy storage module and the DC conversion module in the integrated energy storage and charging device and the charging demand information of the device to be charged; according to the respective power supply capacity information of the energy storage module and the DC conversion module and the charging demand information of the device to be charged, determine the working state of the DC conversion module; where the working state includes a positive polarity working state and a reverse polarity working state;

[0038] The charging unit is configured to control the charging module in the integrated energy storage and charging device to charge the device to be charged according to the working state of the DC conversion module;

[0039] Wherein, the integrated energy storage and charging device includes an energy storage module, a DC conversion module, and a charging module. The DC conversion module is configured to provide the input external power to the charging module, and the DC conversion module is connected in series with the energy storage module so that the charging module can provide the required charging power to the device to be charged.

[0040] In a third aspect, an embodiment of the present application provides a charging system, which includes a device to be charged and an integrated charging and storage device; wherein, the integrated charging and storage device includes the charging control device as described in the second aspect.

[0041] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed, it implements the charging control method as described in any one of the first aspect.

[0042] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, rather than limiting the technical solutions of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the composition structure of an integrated charging and storage device provided by an embodiment of the present application Figure 1 ;

[0044] Figure 2 Schematic diagram of the composition structure of an integrated charging and storage device provided by an embodiment of the present application Figure 2 ;

[0045] Figure 3 Schematic diagram of the composition structure of an integrated charging and storage device provided by an embodiment of the present application Figure 3 ;

[0046] Figure 4 Schematic diagram of the flow of a charging control method provided by an embodiment of the present application Figure 1 ;

[0047] Figure 5 Schematic diagram of the flow of a charging control method provided by an embodiment of the present application Figure 2 ;

[0048] Figure 6 Schematic diagram of the flow of a charging control method provided by an embodiment of the present application Figure 3 ;

[0049] Figure 7 Detailed flow schematic diagram of a charging control method provided by an embodiment of the present application;

[0050] Figure 8 Schematic diagram of the composition structure of a charging control device provided by an embodiment of the present application;

[0051] Figure 9 Schematic diagram of the composition structure of a charging system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] In order to understand the features and technical content of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The attached drawings are only for reference and explanation, and are not used to limit the embodiments of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0054] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0055] It should also be noted that the terms "first / second / third" involved in the embodiments of this application are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first / second / third" can be interchanged with a specific order or sequence when allowed, so that the embodiments of this application described here can be implemented in an order other than that illustrated or described here.

[0056] In addition, the mention of "embodiments" in this article means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0057] The following is an introduction to the related technologies of this application.

[0058] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being used more and more in the energy storage field, etc.

[0059] At present, new energy batteries are being used more and more widely in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand for them is also continuously increasing.

[0060] In the embodiments of the present application, the battery may be a single battery cell, or may also be a battery pack (Pack) composed of multiple battery cells. A single battery cell refers to the basic unit that can realize the mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. The single battery cell may be a secondary battery, which refers to a single battery cell that can continue to be used after the active material is activated by charging after the single battery cell discharges. The single battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure do not limit this.

[0061] In the embodiments of the present application, the battery may also be a single physical module including one or more battery cells to provide a higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a hybrid connection through a busbar component.

[0062] The integrated energy storage and charging device is a device that integrates an energy storage system and a charging function. It can store the electric energy of the power grid through the internal energy storage battery during the low electricity consumption period, and provide charging services for new energy vehicles through the energy storage battery during the high electricity consumption period, thereby effectively alleviating the power grid load, optimizing the utilization of power resources, reducing the electricity cost, and playing the role of peak shaving and valley filling.

[0063] Although the integrated energy storage and charging device can charge new energy vehicles through the internal energy storage battery, the voltage output by the energy storage battery is fixed, which indeed limits the flexibility of energy storage and charging of the integrated energy storage device to a certain extent. And because the capacity and charging power of the energy storage battery are fixed, it is impossible to achieve the optimal energy storage and charging strategy when facing different charging demands and power grid loads.

[0064] In addition, the integrated energy storage and charging device can charge new energy vehicles through the internal energy storage battery, but the voltage output by the energy storage battery is fixed, and its output voltage is difficult to match the charging voltages of various new energy vehicles, reducing the charging efficiency.

[0065] Based on this, an embodiment of the present application provides a charging control method. According to the power supply capacity information of the energy storage module and the DC conversion module respectively, and the charging demand information of the device to be charged, the working state of the DC conversion module is determined, so as to control the charging module to charge the device to be charged according to the positive polarity working state or the reverse polarity working state of the DC conversion module. In this way, according to the working state of the DC conversion module, the charging power output by the DC conversion module and the charging power provided by the energy storage module are jointly provided to the charging module, so that the charging power output by the charging module is wider than the input range of the external power, and the flexibility of the charging power output by the charging module can be improved, so that the range of the charging power is larger, so that the voltage adaptation can be achieved with a variety of devices to be charged, the applicable range of the energy storage and charging integrated device is expanded, and the charging efficiency is improved.

[0066] The following further describes the present application in detail through the drawings and specific embodiments.

[0067] In an embodiment of the present application, Figure 1 is a schematic diagram of the composition structure of an energy storage and charging integrated device provided by an embodiment of the present application Figure 1 . As Figure 1 shown, the energy storage and charging integrated device 10 includes an energy storage module 101, a DC conversion module 102, and a charging module 103; where:

[0068] The input end of the DC conversion module 102 is configured to receive external power;

[0069] The first output end of the DC conversion module 102 is connected to the second output end of the energy storage module 101, the second output end of the DC conversion module 102 is connected to the second input end of the charging module 103, and the first input end of the charging module 103 is connected to the first input end of the energy storage module 101;

[0070] The charging module 103 is connected in series with the DC conversion module 102 and the energy storage module 103, and is configured to output or receive electric energy to the device to be charged.

[0071] In the embodiment of the present application, for the first output end P1 of the DC conversion module 102, the second output end P2 of the DC conversion module 102, the first output end P3 of the energy storage module 101, the second output end P4 of the energy storage module 101, the first input end P5 of the charging module 103, and the second input end P6 of the charging module 103, it can be determined as the positive extreme or the negative extreme according to the specific structure respectively, so as to realize the series connection of the charging module 103, the DC conversion module 102, and the energy storage module 103.

[0072] In the embodiment of the present application, the energy storage module 101 may be a storage battery capable of storing electric energy in the integrated charging and storage device 10, such as a lithium iron phosphate battery, a lithium-ion battery, etc. The energy storage module 101 can store the electric energy output or converted by the AC power grid 201 or renewable energy sources, such as photovoltaic power generation equipment. Among them, the battery capacity and type of the energy storage module 101 are not limited here, but generally, the output power U2 of the energy storage module 101, that is, the second charging power, is generally greater than 210 kW.

[0073] In the embodiment of the present application, the external power can be a power supply device or an AC power grid, and no specific limitation is made thereto. It should be noted that if the external power is an AC power grid, an AC-DC conversion module needs to be connected between the AC power grid and the DC conversion module. The connection between the AC power grid and the AC-DC conversion module can output an AC voltage and an AC current to the AC-DC conversion module. The AC-DC conversion module is configured to convert the AC voltage and AC current output by the AC power grid into direct current to output direct current to the DC conversion module. In addition, the AC power grid can be a three-phase AC power grid, and its input power is generally less than or equal to 150 kW. Those skilled in the art can understand that the AC power grid 201 generally refers to a system capable of providing power. As an example, the AC power grid can be a power source of municipal power.

[0074] In the embodiment of the present application, the DC conversion module 102 can be an isolated bidirectional (Direct current-Direct current, DCDC) module. When the first input end of the DC conversion module 102 is connected to the second output end of the energy storage module 101 and the second input end of the DC conversion module 102 is connected to the first output end of the energy storage module 101, the DC conversion module 102 can realize the output of positive and negative DC voltages. That is, the DC conversion module 102 can adjust the direction of the output voltage in the received external power without changing the direction of the current, and output a positive or negative voltage. When the DC conversion module 102 outputs a positive voltage, that is, when outputting a voltage to the second output end of the energy storage module 101, the DC conversion module 102 works in a positive polarity mode; when the DC conversion module 102 outputs a reverse voltage, that is, when outputting a voltage to the first output end of the energy storage module 101, the DC conversion module 102 works in an anti-polarity mode.

[0075] Among them, when the first voltage value of the device to be charged 202 is greater than or equal to the second voltage value of the energy storage module 101, the working state of the DC conversion module 102 is the positive polarity state, and the output first charging power is positive; when the first voltage value of the device to be charged 202 is less than the second voltage value of the energy storage module 101, the working state of the DC conversion module 102 is the anti-polarity state, and the output first charging power is negative.

[0076] In the embodiment of the present application, -Ua ≤ U1 - U2 ≤ +Ub, where U1 is the battery voltage of the device to be charged 202, that is, the first voltage value output by the charging module 103, U2 is the second voltage value output by the energy storage module 101, -Ua is the limit of the negative voltage output by the DC conversion module 102, and +Ub is the limit of the positive voltage output by the DC conversion module 102.

[0077] It should be noted that when U1 - U2 ≥ 0V, that is, the first voltage value of the device to be charged 202 is greater than or equal to the second voltage value of the energy storage module 101, which means that the total voltage of the charging circuit is less than the first voltage value of the device to be charged 202. Therefore, based on the law of conservation of energy, it is necessary to raise the voltage of the charging circuit. At this time, the working mode of the DC conversion module 102 is positive polarity, and a positive voltage is output, that is, the first charging power is positive. The DC conversion module 102 is connected in series with the energy storage module 101, and the sum of the second charging power output by the energy storage module 101 and the first charging power output by the DC conversion module 102 is provided to the charging module 103, so that the charging module 103 charges the device to be charged 202.

[0078] It should also be noted that when U1 - U2 < 0V, that is, the first voltage value of the device to be charged 202 is less than the second voltage value of the energy storage module 101, which means that the total voltage of the charging circuit is greater than the first voltage value of the device to be charged 202. Therefore, based on the law of conservation of energy, it is necessary to lower the voltage of the charging circuit. At this time, the working mode of the DC conversion module 102 is reverse polarity, and the DC conversion module 102 outputs a negative voltage, that is, the negative work is fed back to the energy storage module 101 through the bus connected between the DC conversion module 102 and the energy storage module 101, reducing the output voltage of the energy storage module 101, and the voltage reduction amplitude is the value of the negative voltage output by the DC conversion module 102. In this way, the DC conversion module 102 works in a reverse polarity manner, providing a negative first charging power for the energy storage module 101, reducing the output power of the energy storage module 101, and then the energy storage module 101 provides the fourth charging power after canceling the first charging power to the charging module 103, so that the charging module 103 charges the device to be charged 202.

[0079] In the embodiment of the present application, it should be understood that as the charging process progresses, the second voltage value output by the energy storage module 101 and the first voltage value output by the device to be charged 202 may change. Therefore, voltage detection modules can be set on the energy storage module 101 and the device to be charged 202 to detect the voltage change in real time, and adjust the output first charging power of the DC conversion module 102 according to the comparison result of the first voltage value and the second voltage value, and control whether the DC conversion module 102 works in a positive polarity manner or a reverse polarity manner.

[0080] It should also be noted that the external power can be an external power source or an AC power grid.

[0081] An embodiment of the present application provides a combined charging and energy storage device. The DC conversion module converts the input external power and, based on the structure in which the charging module, the energy storage module, and the DC conversion module are connected in series, outputs charging power to the device to be charged or receives electric energy. In this way, since the charging power output by the DC conversion module adjusts the charging power provided by the energy storage module, the charging power output by the charging module has a wider range compared to the input range of the external power, and the flexibility of the charging power output by the charging module can be improved, enabling voltage adaptation with a variety of devices to be charged, thereby expanding the applicable range of the combined charging and energy storage device and improving the charging efficiency.

[0082] In some embodiments, Figure 2 is a schematic diagram of the composition structure of a combined charging and energy storage device provided by an embodiment of the present application Figure 2 . As Figure 2 shown, the positive terminal of the energy storage module 101 is connected to the negative output terminal of the DC conversion module 102, and the negative terminal of the energy storage module 101 is connected to the negative input terminal of the charging module 103.

[0083] In the embodiment of the present application, the first output terminal P1 of the DC conversion module 102 may be the negative output terminal, and the second output terminal P2 of the DC conversion module 102 may be the positive output terminal. The first output terminal P3 of the energy storage module 101 may be the negative output terminal, the second output terminal P4 of the energy storage module 101 may be the positive output terminal, and the first input terminal P5 of the charging module 103 may be the negative input terminal, and the second input terminal P6 of the charging module 103 may be the positive input terminal. It should be understood that whether each terminal in each module is the positive terminal or the negative terminal is determined according to the device situation. In the present application and the following embodiments, the description is based on Figure 2 the shown embodiment.

[0084] In some embodiments, the negative output terminal of the energy storage module 101 is connected to the positive output terminal of the DC conversion module 102, and the positive output terminal of the energy storage module 101 is connected to the positive output terminal of the charging module 103.

[0085] In the embodiment of the present application, the first output terminal P1 of the DC conversion module 102 may be the negative output terminal, and the second output terminal P2 of the DC conversion module 102 may be the positive output terminal. The first output terminal P3 of the energy storage module 101 may be the negative output terminal, and the second output terminal P4 of the energy storage module 101 may be the positive terminal. The first input terminal P5 of the charging module 103 may be the negative input terminal, and the second input terminal P6 of the charging module 103 may be the positive input terminal.

[0086] An embodiment of the present application provides a combined energy storage and charging device. The energy storage module can be arranged on the positive side of the DC conversion module or on the negative side of the DC conversion module. In this way, the flexibility of module arrangement in the combined energy storage and charging device can be improved.

[0087] In another embodiment of the present application, Figure 3 is a schematic diagram of the composition structure of a combined energy storage and charging device provided by an embodiment of the present application Figure 3 . As Figure 3 shown, the combined energy storage and charging device 10 further includes an AC-DC conversion module 104; wherein:

[0088] The input end of the AC-DC conversion module 104 is connected to the AC power grid 201;

[0089] The first output end of the energy storage module 101 is respectively connected to the first output end of the AC-DC conversion module 104 and the first input end of the DC conversion module 102; the second output end of the energy storage module 101 is respectively connected to the second output end of the AC-DC conversion module 104, the second input end of the DC conversion module 102, and the first output end of the DC conversion module 102;

[0090] The AC-DC conversion module 104 is configured to provide charging power to the DC conversion module.

[0091] In an embodiment of the present application, the AC-DC conversion module 104 can be an isolated bidirectional AC / DC (Alternating current / Direct current) converter, or a rectifier, which is a power conversion device capable of converting alternating current into direct current or converting direct current into alternating current. Among them, an isolation chip can also be arranged in the AC-DC conversion module 104 to isolate the AC power grid 201 from the subsequent charging module 103, the device to be charged 202, etc., to prevent the AC power grid 201 from damaging the combined energy storage and charging device 10 and the device to be charged 202. It should be understood that after the input power of the AC power grid 201 is converted by the AC-DC conversion module 104, its output power provided to the DC conversion module should be less than or equal to 150 kW.

[0092] It should also be noted that the AC-DC conversion module 104 can be arranged inside the combined energy storage and charging device 10 or outside the combined energy storage and charging device 10, and is set according to actual needs.

[0093] In an embodiment of the present application, as Figure 3 shown, the AC-DC conversion module 104 is arranged inside the combined energy storage and charging device 10. Although this solution increases the volume of the combined energy storage and charging device 10 to a certain extent, the requirements for the charging interface with the AC power grid 201 are reduced, so charging can be made more convenient.

[0094] An embodiment of the present application provides a combined energy storage and charging device, where the energy storage module is connected to both the AC-DC conversion module and the DC conversion module. In this way, the DC conversion module can output voltage to the energy storage module bidirectionally, thereby adjusting the output power of the charging module and expanding the voltage adaptation range of the combined energy storage and charging device for the device to be charged.

[0095] In one embodiment, referring to Figure 3 , the combined energy storage and charging device 10 further includes a first switch module and a second switch module. The first switch module 105 includes a first switch K1 and a second switch K2, and the second switch module 106 includes a third switch K3, a fifth switch K5, and a sixth switch K6; where:

[0096] The first switch K1 is connected in series between the first input end of the DC conversion module 102 and the first output end of the energy storage module 101. The second switch K2 is connected in series between the second input end of the DC conversion module 102 and the second output end of the energy storage module 101. The third switch K3 is connected in series between the first output end of the DC conversion module 102 and the second output end of the energy storage module 101. The fifth switch K5 is connected in series between the second output end of the DC conversion module 102 and the second input end of the charging module 103. The sixth switch K6 is connected in series between the first output end of the energy storage module 101 and the first input end of the charging module 103.

[0097] In an embodiment of the present application, when it is necessary to charge the device to be charged 202 through the integrated storage and charging device 10, the first switch K1, the second switch K2, the third switch K3, the fifth switch K5, and the sixth switch K6 can be controlled to conduct simultaneously. Based on the foregoing embodiment, according to the relationship between the output voltage of the energy storage module 101 and the voltage of the device to be charged 202, the DC conversion module 102 is controlled to operate in a positive polarity mode or an anti-polarity mode. When operating in the positive polarity mode, the sum of the first charging power and the second charging power is used as the third charging power to supply power to the device to be charged 202; or, when operating in the anti-polarity mode, the second charging power after canceling the negative first charging power is used as the fifth charging power to supply power to the device to be charged 202. Alternatively, when the first switch K1, the second switch K2, the third switch K3, the fifth switch K5, and the sixth switch K6 are all turned off, the power supply to the device to be charged 202 is stopped. Among them, when the DC conversion module 102 operates in the positive polarity mode, the DC conversion module 102 does positive work, and the direction of the output current and the direction of the output voltage are positive. The positive direction is that the output terminal of the DC conversion module 102 outputs voltage in the direction of the charging module 103; or, when the DC conversion module 102 operates in the anti-polarity mode, the DC conversion module 102 does negative work, the direction of the output current is still positive, and the direction of the output voltage is reverse. The reverse direction means that the DC conversion module 102 outputs voltage in the direction of the energy storage module 101 via the path where the first switch K1 and the second switch K2 are located.

[0098] In an embodiment of the present application, the first switch K1 and the second switch K2 are used to control the on / off of the circuit between the DC conversion module 102 and the energy storage module 101. Based on the foregoing embodiment, the DC conversion module 102 can operate in a positive polarity mode or an anti-polarity mode according to the comparison between the output voltage of the energy storage module 101 and the voltage of the device to be charged 202. When the DC conversion module 102 operates in the anti-polarity mode, the first switch K1 and the second switch K2 can be controlled to be both closed, so that the DC conversion module 102 outputs a negative voltage to the energy storage module 101 through the circuit between the DC conversion module 102 and the energy storage module 101.

[0099] It should be noted that in some embodiments, when the integrated storage and charging device 10 is powered on, the first switch K1 and the second switch K2 can be controlled to be always in the on state, regardless of the current operating mode of the DC conversion module 102. In this way, the control logic can be simplified.

[0100] Alternatively, when there is no device to be charged 202 to be charged, only the first switch K1 and the second switch K2 can be turned on, so as to control the AC power grid 201 to charge the energy storage module 101. Or, the energy storage module 101 is controlled to feedback electric energy to the AC power grid 201.

[0101] In some embodiments, continue to refer toFigure 3 , the integrated energy storage and charging device 10 further includes a third switch module, and the third switch module includes a fourth switch K4; the fourth switch K4 is connected in series between the second input terminal of the DC conversion module 102 and the second input terminal of the charging module 103.

[0102] In the embodiment of the present application, when the first switch K1, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are all in the on state and the second switch K2 and the third switch K3 are in the off state, the charging module 103 can charge the device to be charged 202 based on the charging power provided by the AC-DC conversion module 104, or feed back electrical energy to the AC power grid 201 based on the output power of the device to be charged 202.

[0103] In the embodiment of the present application, the integrated energy storage and charging device may further include a control module. Through the control module, the power of the energy storage module 101 can be detected. If the power of the energy storage module 101 is insufficient, the first switch K1, the fourth switch K4, the fifth switch K5, and the sixth switch K6 can be controlled to be all in the on state, and only the AC power grid 201 is allowed to charge the device to be charged 202, or the device to be charged 202 feeds back electrical energy to the AC power grid 201.

[0104] In the embodiment of the present application, the integrated energy storage and charging device further includes a control module; wherein: the control module is connected to the first switch module, the second switch module, and the third switch module, and is configured to send control signals to the first switch module, the second switch module, and the third switch module; wherein, the control signals are used to control the on and off states of each switch in the first switch module, the second switch module, and the third switch module.

[0105] In the embodiment of the present application, the control module may include devices such as a microcontroller unit (MCU), a sensor, and a switch circuit, and is used for monitoring, controlling, and managing the integrated energy storage and charging device 10. In addition, the control module may be inside or outside the integrated energy storage and charging device.

[0106] In the embodiment of the present application, the control module may send control signals to each switch in the first switch module, the second switch module, and the third switch module respectively. It should be understood that each control signal may have different level states, and the on or off of the corresponding switch is controlled based on the level state of the control signal. Exemplarily, when the control signal is in the high level state, the corresponding switch can be controlled to be on, and when the control signal is in the low level state, the corresponding switch can be controlled to be off.

[0107] In the embodiment of the present application, the control module may also be used to detect and monitor the current and voltage conditions of each module in the integrated energy storage and charging device 10, and give an alarm in time when an abnormality occurs.

[0108] In some embodiments, the AC-DC conversion module 104 is a bidirectional AC-DC module, and the DC conversion module 102 is a bidirectional DC-DC module.

[0109] It should be noted that the AC-DC conversion module 104 may also be an isolated unidirectional AC-DC module or an isolated bidirectional AC-DC module. An isolation chip is provided inside to isolate the integrated energy storage and charging device 10 from the grid side. The specific structure of the AC-DC conversion module 104 is not limited here.

[0110] It should be noted that the DC conversion module 102 may also be an isolated unidirectional DC-DC module or an isolated bidirectional DC-DC module. An isolation chip is provided inside to isolate the integrated energy storage and charging device 10 from the AC-DC conversion module 104, and it can operate in a positive or reverse polarity manner based on the control of the control module. Among them, the specific structure of the DC conversion module 102 is not limited here.

[0111] In some embodiments, the voltage difference between the first voltage value of the device to be charged and the second voltage value of the energy storage module is less than or equal to a first preset value.

[0112] It should be noted that in the case where no transformer is provided, the voltage input from the AC power grid to the integrated energy storage and charging device 10 is less than or equal to the first preset value. Among them, the value of the first preset value can be determined according to the actual situation and can be 250 volts or 350 volts. Therefore, by controlling the number of energy storage units connected, the output voltage of the energy storage module, that is, the second voltage value, can be adjusted, or the voltage value output by the DC conversion module can be adjusted so that the difference between it and the charging voltage of the device to be charged 202, that is, the first voltage value, is less than or equal to the first preset value.

[0113] The embodiment of the present application provides an integrated energy storage and charging device. By controlling the conduction and disconnection of each switch in the first switch module and the second switch module, based on the working state of the DC conversion module, it charges the device to be charged together with the energy storage module, and controls whether the integrated energy storage and charging device charges the device to be charged and whether the AC power grid charges the energy storage module. In this way, not only the power applicable range of the device to be charged is broadened, but also the switch can be turned off when charging is not required, reducing energy waste.

[0114] In another embodiment of the present application, Figure 4 is a schematic flow chart of a charging control method provided by an embodiment of the present application Figure 1 . As Figure 4 shown, the charging control method may include:

[0115] S401: Determine the power supply capacity information of the energy storage module and the DC conversion module in the integrated energy storage and charging device respectively, and the charging requirement information of the device to be charged.

[0116] In the embodiments of the present application, the charging control method can be applied to the integrated energy storage and charging device as described in the foregoing embodiments. For example, Figure 1 as shown, the integrated energy storage and charging device may include an energy storage module, a DC conversion module, and a charging module. The DC conversion module is configured to provide the input external power to the charging module, and the DC conversion module is connected in series with the energy storage module so that the charging module can provide the required charging power to the device to be charged.

[0117] In the embodiments of the present application, the device to be charged may be an electrical device, such as a battery vehicle, a ship, or a spacecraft. Alternatively, the device to be charged may be another energy storage module different from the energy storage module described above, and the state of charge (SOC) of the other energy storage module is relatively small.

[0118] In the embodiments of the present application, the charging requirement information of the device to be charged may indicate the charging requirement power of the device to be charged when charging is required, or the device to be charged needs to feedback electrical energy to the external power (i.e., V2G requirement). For the power supply capacity information of the DC conversion module, it may be determined by the external power, and the power supply energy of the DC conversion module is determined by receiving the external power. The power supply energy of the energy storage module may be determined by the SOC, voltage, etc. of the energy storage module.

[0119] In the embodiments of the present application, the integrated energy storage and charging device determines the working state of the DC conversion module according to the charging requirement information of the charging requirement power of the device to be charged and the power supply capacity information of the energy storage module and the DC conversion module respectively. In this way, without hardware improvement of the external power (such as an AC power grid), the charging requirement of the device to be charged can be met within the discharge capacity range of the integrated energy storage and charging device, thereby improving the output power of the integrated energy storage and charging device, and further achieving the purpose of charging the device to be charged with small power input and large power output. For example, there is no need to additionally configure an external transformer for the power grid or expand the transformer capacity, so that the charging rate of the device to be charged can be improved with a relatively small construction cost.

[0120] S402: Determine the working state of the DC conversion module according to the power supply capacity information of the energy storage module and the DC conversion module respectively, and the charging requirement information of the device to be charged.

[0121] In the embodiments of the present application, the working states of the DC conversion module include a positive-polarity working state and a reverse-polarity working state. Specifically, the DC conversion module can achieve DC positive and negative voltage outputs, that is, the DC conversion module can adjust the direction of the output voltage in the received external power without changing the current direction, and output a positive or negative voltage. When the DC conversion module outputs a positive voltage, that is, when outputting a voltage to the second output terminal of the energy storage module, the DC conversion module works in a positive-polarity manner (i.e., the positive-polarity working state); when the DC conversion module outputs a reverse voltage, that is, when outputting a voltage to the first output terminal of the energy storage module, the DC conversion module works in a reverse-polarity manner (i.e., the positive-polarity working state).

[0122] S403. Control the charging module in the charge-discharge integrated device to charge the device to be charged according to the working state of the DC conversion module.

[0123] In some embodiments, when the DC conversion module is in the positive-polarity working state, provide the first charging power output by the DC conversion module and the second charging power output by the energy storage module to the charging module, and the third charging power output by the charging module charges the device to be charged; or, when the DC conversion module is in the reverse-polarity working state, feedback the first charging power output by the DC conversion module to the energy storage module, and provide the fourth charging power output by the energy storage module to the charging module, and the fifth charging power output by the charging module charges the device to be charged.

[0124] In this way, in the embodiments of the present application, through the working state of the DC conversion module, the first charging power provided by the DC conversion module and the second charging power provided by the energy storage module are used to charge the device to be charged by the charging module in a superimposed or offset manner, which can improve the flexibility of the charging power output by the charging module and broaden the applicable range of the device to be charged.

[0125] The present application provides a charging control method. According to the power supply capacity information of the energy storage module and the DC conversion module respectively and the charging requirement information of the device to be charged, determine the working state of the DC conversion module, so as to control the charging module to charge the device to be charged according to the positive-polarity working state or the reverse-polarity working state of the DC conversion module. In this way, according to the working state of the DC conversion module, the charging power output by the DC conversion module and the charging power provided by the energy storage module are jointly provided to the charging module, so that the charging power output by the charging module has a wider range than the input range of the external power, and can improve the flexibility of the charging power output by the charging module, making the range of the charging power larger, so that voltage adaptation can be achieved with a variety of devices to be charged, expanding the applicable range of the charge-discharge integrated device, and improving the charging efficiency.

[0126] In some embodiments, according to the power supply capacity information of the energy storage module and the DC conversion module respectively, and the charging requirement information of the device to be charged, the working state of the DC conversion module is determined, including: providing a first charging power to the charging module according to the power supply capacity information of the DC conversion module; providing a second charging power to the charging module according to the power supply capacity information of the energy storage module; and determining the working state of the DC conversion module according to the first charging power, the second charging power and the charging requirement information of the device to be charged.

[0127] In an embodiment of the present application, when the external power input to the DC conversion module is an AC power grid, an AC-DC conversion module is further included in the integrated energy storage and charging device. The input end of the AC-DC conversion module is connected to the AC power grid, and the output end of the AC-DC conversion module is connected to the input end of the DC conversion module. The AC-DC conversion module is used to convert the AC current provided by the AC power grid into DC power and provide it to the DC conversion module.

[0128] In an embodiment of the present application, when the charging requirement information of the device to be charged indicates that the device to be charged needs to be charged and indicates the charging requirement power of the device to be charged, the working state of the DC conversion module is determined according to the first charging power, the second charging power and the charging requirement power.

[0129] In an embodiment of the present application, when the charging requirement power of the device to be charged is greater than the second charging power provided by the energy storage module, it is necessary to increase the charging power provided by the charging module to the device to be charged. At this time, the working state of the DC conversion module is the positive polarity working state, that is, a positive first charging power is output. The DC conversion module is connected in series with the energy storage module, and the sum of the second charging power output by the energy storage module and the first charging power output by the DC conversion module is provided to the charging module, so that the charging module charges the device to be charged.

[0130] In an embodiment of the present application, if the second charging power provided by the energy storage module is greater than the charging requirement power of the charging device of the device to be charged, it is necessary to reduce the charging power provided by the charging module to the device to be charged. At this time, the working state of the DC conversion module is the reverse polarity working state, that is, a reverse first charging power is output, and the second charging power output by the energy storage module offsets the first charging power output by the DC conversion module and provides it to the charging module, so that the charging module charges the device to be charged.

[0131] In this way, in an embodiment of the present application, according to the working state of the DC conversion module, the charging power output by the DC conversion module and the charging power provided by the energy storage module are jointly provided to the charging module, so that the charging power output by the charging module has a wider range than the input range of the external power, and the flexibility of the charging power output by the charging module can be improved, so that the range of the charging power is larger, so that voltage adaptation can be achieved with a variety of devices to be charged, the applicable range of the integrated energy storage and charging device is expanded, and the charging efficiency is improved.

[0132] In some embodiments, the charging control method further includes: determining the operating state of the DC conversion module according to the first voltage value of the device to be charged and the second voltage value of the energy storage module.

[0133] When the first voltage value of the device to be charged is greater than or equal to the second voltage value of the energy storage module, the operating state of the DC conversion module is the positive-polarity operating state, and the first charging power output is positive; when the first voltage value of the device to be charged is less than the second voltage value of the energy storage module, the operating state of the DC conversion module is the reverse-polarity operating state, and the first charging power output is negative.

[0134] In the embodiments of the present application, -Ua ≤ U1 - U2 ≤ +Ub, where U1 is the battery voltage of the device to be charged, that is, the first voltage value output by the charging module, U2 is the second voltage value output by the energy storage module, -Ua is the limit of the negative voltage output by the DC conversion module, and +Ub is the limit of the positive voltage output by the DC conversion module.

[0135] It should be noted that when U1 - U2 ≥ 0V, that is, when the first voltage value of the device to be charged is greater than or equal to the second voltage value of the energy storage module, that is, the total voltage of the charging circuit is less than the first voltage value of the device to be charged. Therefore, based on the law of conservation of energy, it is necessary to raise the voltage of the charging circuit. At this time, the operating mode of the DC conversion module is positive polarity, and a positive voltage is output, that is, the first charging power is positive. The DC conversion module is connected in series with the energy storage module, and the sum of the second charging power output by the energy storage module and the first charging power output by the DC conversion module is used to charge the device to be charged.

[0136] It should also be noted that when U1 - U2 < 0V, that is, when the first voltage value of the device to be charged is less than the second voltage value of the energy storage module, that is, the total voltage of the charging circuit is greater than the first voltage value of the device to be charged. Therefore, based on the law of conservation of energy, it is necessary to lower the voltage of the charging circuit. At this time, the operating mode of the DC conversion module is reverse polarity, and the DC conversion module outputs a negative voltage, that is, the negative work is fed back to the energy storage module through the bus connecting the DC conversion module and the energy storage module, reducing the output voltage of the energy storage module. The voltage reduction amplitude is the value of the negative voltage output by the DC conversion module. In this way, the DC conversion module operates in a reverse-polarity manner, provides a negative first charging power for the energy storage module, reduces the output power of the energy storage module, and then the energy storage module charges the device to be charged with the fourth charging power after offsetting the first charging power.

[0137] That is to say, in the embodiments of the present application, the operating state of the DC conversion module can be determined according to the first voltage value of the device to be charged and the second voltage value of the energy storage module, so as to control the AC power grid and the energy storage module to jointly supply power to the device to be charged.

[0138] In some embodiments, refer to the foregoingFigure 3 , the integrated charging and energy storage device may further include a first switch and a second switch. Among them, the first switch is connected in series between the first input end of the DC conversion module and the first output end of the energy storage module, and the second switch is connected in series between the second input end of the DC conversion module and the second output end of the energy storage module. Correspondingly, the charging control method may further include: when the DC conversion module is in the positive polarity working state, in response to the first control signal sent by the control module, controlling the first switch and the second switch to be in the off state; when the DC conversion module is in the reverse polarity working state, in response to the second control signal sent by the control module, controlling the first switch and the second switch to be in the on state.

[0139] In the embodiment of the present application, by controlling the on state and off state of the first switch and the second switch to match the working state of the DC conversion module, so that the first charging power provided by the DC conversion module and the second charging power provided by the energy storage module charge the device to be charged through the charging module in a superimposed or offset manner, the flexibility of the charging power output by the charging module can be improved, the range of the charging power can be made larger, so that voltage adaptation can be achieved with a variety of devices to be charged, the applicable range of the integrated charging and energy storage device is expanded, and the charging efficiency is improved.

[0140] In another embodiment of the present application, Figure 5 is a schematic flow chart of a charging control method provided by an embodiment of the present application Figure 2 . As Figure 5 shown, after step S401, the charging control method further includes:

[0141] S501, determining the working mode of the integrated charging and energy storage device according to at least one of the power supply energies of the energy storage module and the DC conversion module and the charging demand information of the device to be charged.

[0142] S502, controlling the flow of electric energy among the energy storage module, the device to be charged, and external power according to the working mode of the integrated charging and energy storage device.

[0143] In the embodiment of the present application, when the integrated charging and energy storage device does not meet the charging cut-off condition, determining the working mode of the integrated charging and energy storage device according to at least one of the power supply energies of the energy storage module and the DC conversion module and the charging demand information of the device to be charged, and controlling the flow of electric energy among the energy storage module, the device to be charged, and the AC power grid according to the working mode. Here, for the charging cut-off condition, the charging cut-off condition is used to represent the national standard charging cut-off condition or the state failure of the integrated charging and energy storage device; among them, the national standard charging cut-off condition may be problems such as overheating and overvoltage of the device to be charged, and the state failure of the integrated charging and energy storage device may be faults such as insulation failure and component damage of the integrated charging and energy storage device.

[0144] In the embodiments of the present application, the working modes of the integrated charging and energy storage device may include a first working mode, a second working mode, a third working mode, a fourth working mode, and a fifth working mode; wherein: the first working mode is used to control the device to be charged to feed electrical energy back to the external power; the second working mode is used to control the external power and the energy storage module to jointly charge the device to be charged; the third working mode is used to control the external power to charge the device to be charged; the fourth working mode is used to control the energy storage module to feed electrical energy back to the external power; the fifth working mode is used to control the external power to charge the energy storage module.

[0145] In the embodiments of the present application, the way of energy flow is selected according to the state information of the energy storage module, the device to be charged, and the external power, which improves the flexibility of charging and energy storage of the integrated charging and energy storage device.

[0146] In some embodiments, the charging control method further includes: when it is detected that the working mode of the integrated charging and energy storage device meets the corresponding preset mode stop condition or the integrated charging and energy storage device meets the charging cut-off condition, stopping the electrical energy flow between the energy storage module, the device to be charged, and the external power.

[0147] In the embodiments of the present application, the stop conditions for the preset modes may include a first stop condition (i.e., the stop condition for the first working mode), a second stop condition (i.e., the stop condition for the second working mode), a third stop condition (i.e., the stop condition for the third working mode), a fourth stop condition (i.e., the stop condition for the fourth working mode), a fifth stop condition (corresponding to the stop condition for the fifth working mode), and a vehicle-to-grid (V2G) stop condition.

[0148] In the embodiments of the present application, if the integrated charging and energy storage device includes a power module, the power module may include an AC-DC conversion module and / or a DC conversion module. Among them, the first stop condition is used to indicate a fault in the device to be charged or a fault in the power module, the second stop condition is used to indicate a fault in the energy storage module or a fault in the power module, the third stop condition is used to indicate a fault in the energy storage module or the power module, the third stop condition is used to indicate a fault in the power module, the fourth stop condition is used to indicate a fault in the energy storage module or the power module, the fifth stop condition is used to indicate a fault in the energy storage module or the energy storage module meets the third preset condition, and the V2G stop condition is used to indicate a fault in the device to be charged. It should be noted that for a fault in the energy storage module, it can be over-temperature of the energy storage module, over-current of the energy storage module, under-voltage of the energy storage module, over-voltage of the energy storage module, etc. That is to say, if the energy storage module has a fault, the energy storage module cannot be controlled to output or receive electric energy. For a fault in the power module, it can be faults such as over-temperature, over-current, and under-voltage of the power module. That is to say, if the power module has a fault, the electric energy converted by the power module cannot be input or output. For a fault in the device to be charged, it can be faults such as over-temperature, over-current, and under-voltage of the device to be charged. That is to say, if the device to be charged has a fault, the device to be charged cannot be controlled to output or receive electric energy.

[0149] In the embodiments of the present application, for the third preset condition, the third preset condition is used to indicate that the state of the energy storage module meets the charging requirement of the device to be charged. For example, the full charge state of the energy storage module meets the charging requirement of the device to be charged.

[0150] In this way, when it is detected that the working mode of the integrated charging and energy storage device meets the corresponding mode stop condition, or the integrated charging and energy storage device meets the charging cut-off condition, such as a fault in the energy storage module or the device to be charged, etc., the electric energy flow between the energy storage module, the device to be charged and the external power is stopped at this time, improving the charging safety.

[0151] The embodiments of the present application provide a charging control method, which can improve the flexibility of charging and energy storage of the integrated charging and energy storage device by selecting the energy flow mode according to the actual situations of the energy storage module, the device to be charged and the AC power grid. For example, when the device to be charged is connected to the integrated charging and energy storage device, the energy storage module and the external power are controlled to charge the device to be charged. Based on the small power provided by the external power, the high-power output of the integrated charging and energy storage device can be realized, thereby reducing the cost of the integrated charging and energy storage device and improving the charging speed of the integrated charging and energy storage device; it can also control the energy storage module to feedback electric energy to the external power or control the external power to charge the energy storage module when the device to be charged is not connected to the integrated charging and energy storage device, achieving the electric energy balance between the energy storage module and the external power, and further improving the utilization rate of electric energy.

[0152] In another embodiment of the present application, the charging control method may further include: detecting whether a communication connection is established between the integrated charging and energy storage device and the device to be charged.

[0153] In an embodiment of the present application, the integrated charging and energy storage device may include a charging module, and the charging module may include a charging gun. By detecting whether the output end of the charging gun is connected to the device to be charged, it is determined whether a communication connection is established between the integrated charging and energy storage device and the device to be charged. Exemplarily, when the charging gun is connected to the device to be charged, an identification signal of the charging gun is obtained, and the identification signal is used to represent that a communication connection is established between the integrated charging and energy storage device and the device to be charged.

[0154] In some embodiments, when it is detected that a communication connection is established between the integrated charging and energy storage device and the device to be charged, the charging control method further includes: determining whether the device to be charged has a vehicle-to-grid (V2G) demand according to the charging demand information of the device to be charged; when the device to be charged has a V2G demand, in response to the V2G demand of the device to be charged, controlling the integrated charging and energy storage device to enter a first working mode; wherein, the first working mode is used to control the device to be charged to feed electric energy back to the external power grid.

[0155] In an embodiment of the present application, if the device to be charged has a V2G demand, the device to be charged can act as an energy storage unit to provide electric energy to the AC power grid. Here, whether the device to be charged has a V2G demand is determined by the device to be charged itself. If the device to be charged has a V2G demand, a message with a V2G request sent by the device to be charged is received, and then the integrated charging and energy storage device is controlled to enter the first working mode, so that the device to be charged feeds electric energy back to the external power (such as the AC power grid).

[0156] In an embodiment of the present application, after the integrated charging and energy storage device enters the first working mode, it is necessary to determine whether the integrated charging and energy storage device reaches a first stop condition or a V2G stop condition. Here, if the integrated charging and energy storage device reaches the first stop condition or the V2G stop condition, the device to be charged is stopped from feeding electric energy back to the AC power grid, avoiding safety problems and dangers caused by faults of the device to be charged, etc., and thus improving the charging safety.

[0157] Thus, in an embodiment of the present application, when it is detected that a communication connection is established between the integrated charging and energy storage device and the device to be charged, if it is determined according to the charging demand information of the device to be charged that the device to be charged has a V2G demand, at this time, the device to be charged can be controlled to feed electric energy back to the external power grid, which can play a role in peak shaving and valley filling for the external power grid, and thus improve the utilization rate of electric energy.

[0158] In some embodiments, as Figure 6 shown, the charging control method further includes:

[0159] S601: When the device to be charged has no V2G requirement, determine whether the energy storage module meets the first preset condition according to the power supply capacity information of the energy storage module.

[0160] In the embodiments of the present application, if the device to be charged has no V2G requirement, the integrated charging and energy storage device can charge the device to be charged at this time. When the integrated charging and energy storage device charges the device to be charged, it can first determine whether the energy storage module meets the first preset condition to determine whether to charge the device to be charged by external power or jointly by external power and the energy storage module.

[0161] In the embodiments of the present application, the power supply capacity information of the energy storage module can be the SOC of the energy storage module or the state of energy (SOE) of the energy storage module, and no specific limitation is made thereto. In addition, the first preset condition is used to characterize the state parameter requirements for the energy storage module to charge the device to be charged. Exemplarily, when the SOC of the energy storage module is greater than the first power threshold, the energy storage module meets the first preset condition; when the SOC of the energy storage module is less than the first power threshold, the energy storage module does not meet the first preset condition; when the SOC of the energy storage module is equal to the first power threshold, it can be considered that the energy storage module does not meet the first preset condition, or it can be considered that the energy storage module meets the first preset condition, and no specific limitation is made thereto.

[0162] Another example, when the SOE of the energy storage module is greater than the first energy threshold, the energy storage module meets the first preset condition; when the SOE of the energy storage module is less than the first energy threshold, the energy storage module does not meet the first preset condition. When the SOH of the energy storage module is equal to the first energy threshold, it can be considered that the energy storage module does not meet the first preset condition, or it can be considered that the energy storage module meets the first preset condition, and no specific limitation is made thereto.

[0163] It should be noted that the first power threshold and the first energy threshold can be determined according to the charging demand power of the device to be charged and the first charging power of the DC conversion module, or can be determined according to the power supply capacity information of the energy storage module itself, and no specific limitation is made thereto.

[0164] S602: When the energy storage module meets the first preset condition, determine that the integrated charging and energy storage device enters the second working mode.

[0165] In the embodiments of the present application, if the energy storage module meets the first preset condition, the energy storage module and external power can be controlled to jointly charge the device to be charged at this time.

[0166] In some embodiments, after the integrated charging and energy storage device enters the second working mode, the charging control method further includes: when it is detected that the integrated charging and energy storage device meets the stop condition of the second working mode, determine that the integrated charging and energy storage device enters the third working mode.

[0167] In the embodiment of the present application, when it is detected that the integrated energy storage and charging device reaches the stop condition of the second working mode (i.e., the second stop condition), that is, there are faults such as overheating and overcurrent in the energy storage module. At this time, the AC power grid can be controlled to charge the device to be charged alone, avoiding safety problems caused by faults in the energy storage module, thereby improving the charging safety.

[0168] In the embodiment of the present application, when the device to be charged does not have V2G requirements, that is, the device to be charged needs to be charged. During the charging process of the device to be charged, it is necessary to detect whether the SOC of the device to be charged is greater than or equal to the required power of the device to be charged. If the SOC of the device to be charged is greater than or equal to the required power of the device to be charged, the integrated energy storage and charging device stops charging the device to be charged.

[0169] S603: When the energy storage module does not meet the first preset condition, it is determined that the integrated energy storage and charging device enters the third working mode.

[0170] In the embodiment of the present application, if the energy storage module does not meet the first preset condition, at this time, the device to be charged is charged separately by external power.

[0171] It should be noted that after the integrated energy storage and charging device enters the second working mode, it is necessary to judge whether the integrated energy storage and charging device meets the second stop condition or the charging cut-off condition. When the integrated energy storage and charging device enters the third working mode, it is necessary to judge whether the integrated energy storage and charging device meets the third stop condition or the charging cut-off condition. If it is judged that the integrated energy storage and charging device meets the corresponding stop condition or the charging cut-off condition, at this time, the integrated energy storage and charging device stops charging the device to be charged.

[0172] It should also be noted that when the integrated energy storage and charging device enters the third working mode and charges the device to be charged, it is necessary to judge whether the SOC of the device to be charged is greater than or equal to the required power of the device to be charged. For example, if the device to be charged is fully charged, if the device to be charged is fully charged, the charging of the device to be charged is stopped.

[0173] In the embodiment of the present application, if it is determined according to the charging demand information of the device to be charged that the device to be charged does not have V2G requirements, at this time, it can be judged whether the energy storage module meets the first preset condition, that is, whether the power of the energy storage module is sufficient. According to the actual situation of the energy storage module, it is selected whether to supply power to the device to be charged in combination with external power, so as to avoid over-discharging of the energy storage module and causing safety problems, thereby improving the charging safety; and based on the small power provided by external power, the high-power output of the integrated energy storage and charging device can be realized, so that the cost of the integrated energy storage and charging device can be reduced and the charging speed of the integrated energy storage and charging device can be improved.

[0174] It should also be noted that in this application, if the device to be charged needs to be charged and the power supply load of the external power is in an overload state, the energy storage module can be used to charge the device to be charged alone.

[0175] In a specific embodiment, the integrated charging and energy storage device further includes a third switch and a fourth switch, and the charging control method further includes: when the integrated charging and energy storage device is in the first working mode, in response to a third control signal sent by the control module, controlling the first switch and the fourth switch to be in the on state and the second switch and the third switch to be in the off state; when the integrated charging and energy storage device is in the second working mode, in response to a fourth control signal sent by the control module, controlling the third switch to be in the on state and the first switch, the second switch, and the fourth switch to be in the off state; when the integrated charging and energy storage device is in the third working mode, in response to a fifth control signal sent by the control module, controlling the first switch and the fourth switch to be in the on state and the second switch and the third switch to be in the off state; wherein, the third switch is connected in series between the first output end of the DC conversion module and the second output end of the energy storage module, and the fourth switch is connected in series between the second input end of the DC conversion module and the second input end of the charging module.

[0176] In this way, in the embodiments of this application, by controlling the on and off states of the first switch, the second switch, the third switch, and the fourth switch to match the working mode of the integrated charging and energy storage device, charging can be carried out according to the actual situations of the external power, the integrated charging and energy storage device, and the device to be charged, improving the flexibility of charging and energy storage of the integrated charging and energy storage device.

[0177] In another embodiment of this application, the charging control method further includes: when it is detected that the integrated charging and energy storage device and the device to be charged have not established a communication connection, determining to charge the energy storage module based on the output power of the external power, or feeding back electric energy to the external power based on the output power of the energy storage module.

[0178] In some embodiments, when it is detected that the integrated charging and energy storage device and the device to be charged have not established a communication connection, the charging control method further includes: when it is determined that the power supply load of the external power is greater than a preset load threshold, controlling the integrated charging and energy storage device to enter the fourth working mode; wherein, the fourth working mode is used to control the energy storage module to feed back electric energy to the external power.

[0179] In the embodiments of this application, the preset load threshold can be used to represent the power supply load threshold of the external power in a normal state. Exemplarily, if the external power is an AC power grid, when it is detected that the integrated charging and energy storage device and the device to be charged have not established a communication connection, if the power supply load of the AC power grid is greater than the preset threshold, at this time the AC power grid is in an overload state, and the energy storage module is used to feed back electric energy to the AC power grid, playing a role in peak shaving and valley filling for the AC power grid.

[0180] In the embodiment of the present application, after the integrated energy storage and charging device enters the fourth working mode, it is also necessary to determine whether the integrated energy storage and charging device reaches the fourth stop condition. If the integrated energy storage and charging device reaches the fourth stop condition, at this time, the energy storage module may have a fault, and the energy storage module is stopped from feeding back electric energy to the power grid, improving the charging safety. In addition, it is also necessary to determine whether the power of the energy storage module is sufficient. If it is not sufficient, the energy storage module is also stopped from feeding back electric energy to the power grid to avoid safety problems caused by over-discharge of the energy storage module, thereby improving the charging safety. It should be noted that after the energy storage module stops feeding back electric energy to the power grid, the step of detecting whether the integrated energy storage and charging device and the device to be charged establish a communication connection is executed to charge the device to be charged.

[0181] In this way, in the embodiment of the present application, when it is detected that the integrated energy storage and charging device and the device to be charged do not establish a communication connection, if the power supply load of the external power is greater than the preset load threshold, at this time, the energy storage module can be controlled to feed back electric energy to the external power, which can achieve the electric energy balance between the energy storage module and the external power, play a role in peak shaving and valley filling for the external power, and thereby improve the utilization rate of electric energy.

[0182] In some embodiments, when it is detected that the integrated energy storage and charging device and the device to be charged do not establish a communication connection, the charging control method further includes: determining whether the energy storage module meets the second preset condition according to the power supply capacity information of the energy storage module; when the energy storage module does not meet the second preset condition, controlling the integrated energy storage and charging device to enter the fifth working mode; wherein, the fifth working mode is used to control the external power to charge the energy storage module.

[0183] In the embodiment of the present application, the second preset condition is used to characterize whether the power supply capacity information of the energy storage module meets the power supply demand condition for feeding back electric energy to the power grid. Exemplarily, when the SOC of the energy storage module is greater than the second power threshold, at this time, the energy storage module meets the second preset condition; when the SOC of the energy storage module is less than the second power threshold, at this time, the energy storage module does not meet the second preset condition; for the case where the SOC of the energy storage module is equal to the second power threshold, at this time, it can be considered that the energy storage module does not meet the second preset condition, or it can be considered that the energy storage module meets the second preset condition, and no specific limitation is made thereto. Another example is that when the SOE of the energy storage module is greater than the second energy threshold, at this time, the energy storage module meets the second preset condition; when the SOE of the energy storage module is less than the second energy threshold, at this time, the energy storage module does not meet the second preset condition.

[0184] In this way, when it is detected that the integrated energy storage and charging device and the device to be charged do not establish a communication connection, if it is determined according to the power supply energy information of the energy storage module that the energy storage module does not meet the preset second preset condition, that is, the power of the energy storage module is low, at this time, the external power can be controlled to charge the energy storage module, which can store more electric energy for the energy storage module and improve the utilization rate of electric energy.

[0185] In a specific embodiment, referring to the foregoing Figure 3 , the integrated charging and energy storage device further includes a fifth switch and a sixth switch; wherein, the fifth switch is connected in series between the second output end of the DC conversion module and the second input end of the charging module, and the sixth switch is connected in series between the first output end of the energy storage module and the first input end of the charging module. Correspondingly, the charging control method further includes: when the integrated charging and energy storage device is in the fourth working mode, in response to the sixth control signal sent by the control module, controlling the first switch and the second switch to be in the on state and the third switch, the fourth switch, the fifth switch and the sixth switch to be in the off state; when the integrated charging and energy storage device is in the fifth working mode, in response to the seventh control signal sent by the control module, controlling the first switch and the second switch to be in the on state and the third switch, the fourth switch, the fifth switch and the sixth switch to be in the off state.

[0186] In this way, in the embodiment of the present application, by controlling the first switch and the second switch to be in the on state and controlling the third switch, the fourth switch, the fifth switch and the sixth switch to be in the off state, so as to match the fourth working mode or the fifth working mode of the integrated charging and energy storage device, the charging selection can be made according to the external power and the actual situation of the integrated charging and energy storage device. For example, the external power supplies power to the energy storage module, or the energy storage module feeds back electric energy to the external power, which improves the charging flexibility; and it can also balance the electric energy between the energy storage module and the external power, playing a role in peak shaving and valley filling. In addition, the switch can be turned off when charging is not required, reducing energy waste.

[0187] In some embodiments, when the energy storage module meets the second preset condition, or when the integrated charging and energy storage device reaches the stop condition corresponding to the fifth working mode, the step of detecting whether the integrated charging and energy storage device is communicatively connected to the device to be charged is continued.

[0188] That is to say, in the embodiment of the present application, if the energy storage module meets the second preset condition, that is, the energy storage module has sufficient power, or if the integrated charging and energy storage device reaches the stop condition corresponding to the fifth working mode, such as the energy storage module has faults such as overheating and overcurrent, at this time, the AC grid stops charging the energy storage module, and the step of detecting whether the integrated charging and energy storage device is communicatively connected to the device to be charged is executed, which improves the charging safety.

[0189] In still another embodiment of the present application, based on the charging control method of the foregoing embodiment, Figure 7 is a detailed flowchart of a charging control method provided by an embodiment of the present application. Here, the integrated charging and energy storage device includes an energy storage module, a DC conversion module, and a charging module, and the charging module may include a charging gun. The energy storage module may be referred to as an energy storage battery, and the external power may be an AC grid. As Figure 7 shown, the detailed process may include:

[0190] S701, Standby, detect the charging gun signal.

[0191] S702, Is the device to be charged connected to the charging gun and has the integrated storage and charging device established a communication connection with the device to be charged?

[0192] S703, Is there a need for the energy storage battery to feed electrical energy back to the power grid?

[0193] S704, The integrated storage and charging device enters the fourth working mode, and the energy storage battery feeds electrical energy back to the AC power grid.

[0194] S705, Does the integrated storage and charging device reach the fourth stop condition?

[0195] S706, Is the SOC of the energy storage battery ≥ t1% or the SOE ≥ t2%?

[0196] In the embodiment of the present application, t1 is the first power threshold, and t2 is the first energy threshold. Exemplarily, t1 = 60, t2 = 60.

[0197] S707, The integrated storage and charging device enters the fifth working mode, and the AC power grid charges the energy storage battery.

[0198] S708, Does the integrated storage and charging device reach the fifth stop condition?

[0199] S709, Does the device to be charged have a V2G requirement?

[0200] S710, Is the SOC of the energy storage battery ≥ q% or the SOE ≥ p%?

[0201] In the embodiment of the present application, q is the second power threshold, and p is the second energy threshold. Exemplarily, q = 50, p = 50.

[0202] S711, The integrated storage and charging device enters the second working mode, and the AC power grid and the energy storage battery jointly charge the device to be charged.

[0203] S712, Does the integrated storage and charging device reach the second stop condition?

[0204] S713, Does the integrated storage and charging device reach the charging cut-off condition?

[0205] S714, The integrated storage and charging device enters the third working mode, and the AC power grid charges the device to be charged.

[0206] S715, Does the integrated storage and charging device reach the third stop condition or the charging cut-off condition?

[0207] S716, The integrated storage and charging device enters the third working mode, and the AC power grid charges the device to be charged.

[0208] S717, Has the integrated storage and charging device reached the third stop condition or the charging cut-off condition?

[0209] S718, The integrated storage and charging device enters the first working mode, and the electric vehicle feeds electric energy back to the AC power grid.

[0210] S719, Has the integrated storage and charging device reached the first stop condition or the V2G stop condition?

[0211] In the embodiment of the present application, if the judgment result of step S702 indicates yes, step S709 is executed; if the judgment result of step S702 indicates no, step S703 is executed; if the judgment result of step S703 indicates yes, step S704 is executed; if the judgment result of step S703 indicates no, step S706 is executed; if the judgment result of step S705 indicates yes, step S706 is executed; if the judgment result of step S703 indicates no, step S704 is executed; if the judgment result of step S706 indicates yes, step S701 is executed; if the judgment result of step S706 indicates no, step S707 is executed; if the judgment result of step S708 indicates yes, step S701 is executed; if the judgment result of step S708 indicates no, step S707 is executed; if the judgment result of step S709 indicates yes, step S718 is executed; if the judgment result of step S709 indicates no, step S711 is executed; if the judgment result of step S712 indicates yes, step S713 is executed; if the judgment result of step S712 indicates no, step S711 is executed; if the judgment result of step S713 indicates yes, the process ends; if the judgment result of step S713 indicates no, step S714 is executed; if the judgment result of step S715 indicates yes, the process ends; if the judgment result of step S715 indicates no, step S714 is executed; if the judgment result of step S717 indicates yes, the process ends; if the judgment result of step S717 indicates no, step S716 is executed; if the judgment result of step S719 indicates yes, the process ends; if the judgment result of step S719 indicates no, step S718 is executed.

[0212] In a specific embodiment, Figure 7 The provided charging control method is applicable to Figure 3 the integrated storage and charging device shown.

[0213] In the embodiment of the present application, the device to be charged can be a vehicle, specifically an electric vehicle. Based on Figure 3 the integrated storage and charging device described above, the charging control method provided in the embodiment of the present application is elaborated.

[0214] In the embodiment of the present application, as Figure 3As shown, the DC conversion module 102, i.e., the isolated bidirectional DC / DC, realizes the DC positive and negative voltage outputs. -Ua ≤ U1 - U2 ≤ +Ub. Here, U1 is the battery voltage of the device to be charged 202, such as an automobile, U2 is the voltage of the energy storage module 101 inside the integrated energy storage and charging device 10, -Ua is the negative voltage limit of the DC / DC output, and +Ub is the positive voltage limit of the DC / DC output. This method can adapt to the battery voltages of more automobiles without considering the range of the battery voltages of the automobiles.

[0215] (1) The first working mode is the mode in which the automobile feeds electric energy back to the AC power grid. Specifically, when the V2G function is realized and the automobile feeds electric energy to the AC power grid, the second switch K2 and the third switch K3 need to be disconnected, and the first switch K1, the fourth switch K4, the fifth switch K5, and the sixth switch K6 need to be closed, so that the automobile feeds electric energy to the power grid.

[0216] (2) The second working mode is the mode in which the energy storage module and the AC power grid jointly charge the automobile. Specifically, when the integrated energy storage and charging device 10 charges the automobile, the first switch K1, the second switch K2, and the fourth switch K4 need to be disconnected, and the third switch K3, the fifth switch K5, and the sixth switch K6 need to be closed; when U1 - U2 ≥ 0V, the DC / DC works in the positive polarity working state, the DC / DC outputs a positive voltage, and the integrated energy storage and charging device 10 charges the automobile. When U1 - U2 < 0V, the first switch K1 and the second switch K2 are closed, the DC / DC works in the reverse polarity working state, the DC / DC outputs a negative voltage, and the power of the DC / DC is fed back to the bus of the energy storage module 101 through the first switch K1 and the second switch K2, and the integrated energy storage and charging device 10 charges the automobile.

[0217] (3) The third working mode is the mode in which the AC power grid charges the automobile alone. Specifically, when the integrated energy storage and charging device 10 charges the automobile and the energy of the energy storage module 101 inside the integrated energy storage and charging device 10 is insufficient, the AC power grid charges the automobile alone, and the second switch K2 and the third switch K3 need to be disconnected, and the first switch K1, the fourth switch K4, the fifth switch K5, and the sixth switch K6 need to be closed. The power grid charges the automobile alone.

[0218] (4) The fourth working mode is the mode in which the energy storage module 101 feeds electric energy back to the AC power grid. Specifically, when the function of the energy storage device feeding electric energy back to the power grid (i.e., V2G) is realized, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 need to be disconnected, and the first switch K1 and the second switch K2 need to be closed, so that the energy storage module 101 inside the integrated energy storage and charging device 10 feeds electric energy back to the AC power grid.

[0219] (5) The fifth working mode is the working mode in which the energy storage module is charged by the AC power grid. Specifically, when there is no vehicle charging, only the AC power grid 201 supplies energy to the energy storage module 101 inside the integrated charging and energy storage device 10. In this case, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 need to be disconnected, and the first switch K1 and the second switch K2 need to be closed, so that the AC power grid charges the energy storage module 101 alone.

[0220] The embodiment of the present application provides a charging control method, which is applied to Figure 3 the aforementioned integrated charging and energy storage device. The integrated charging and energy storage device can realize high-power output to the device to be charged based on the low-power input of the AC power grid, which not only reduces the cost and volume of the integrated charging and energy storage device, but also improves the charging flexibility and is conducive to the fast charging of the device to be charged.

[0221] Based on the same inventive concept as the foregoing embodiments, Figure 8 it is a schematic structural diagram of the composition of a charging control device provided by the embodiment of the present application. As Figure 8 shown, the charging control device 80 may include a determination unit 801 and a charging unit 802, where:

[0222] The determination unit 801 is configured to determine the respective power supply capacity information of the energy storage module and the DC conversion module in the integrated charging and energy storage device and the charging demand information of the device to be charged; and determine the working state of the DC conversion module according to the respective power supply capacity information of the energy storage module and the DC conversion module and the charging demand information of the device to be charged; where the working state includes a positive-polarity working state and a reverse-polarity working state;

[0223] The charging unit 802 is configured to control the charging module in the integrated charging and energy storage device to charge the device to be charged according to the working state of the DC conversion module;

[0224] Among them, the integrated charging and energy storage device includes an energy storage module, a DC conversion module, and a charging module. The DC conversion module is configured to provide the input external power to the charging module, and the DC conversion module is connected in series with the energy storage module so that the charging module can provide the required charging power to the device to be charged.

[0225] In some embodiments, the determination unit 802 is further configured to provide a first charging power to the charging module according to the power supply capacity information of the DC conversion module; provide a second charging power to the charging module according to the power supply capacity information of the energy storage module; and determine the working state of the DC conversion module according to the first charging power, the second charging power, and the charging demand information of the device to be charged.

[0226] In some embodiments, the charging unit 802 is further configured to, when the DC conversion module is in the positive-polarity working state, supply the first charging power output by the DC conversion module and the second charging power output by the energy storage module to the charging module, and charge the device to be charged with the third charging power output by the charging module; or, when the DC conversion module is in the reverse-polarity working state, feedback the first charging power output by the DC conversion module to the energy storage module, supply the fourth charging power output by the energy storage module to the charging module, and charge the device to be charged with the fifth charging power output by the charging module.

[0227] In some embodiments, the integrated charging and energy storage device further includes a first switch and a second switch. The first switch is connected in series between the first input end of the DC conversion module and the first output end of the energy storage module, and the second switch is connected in series between the second input end of the DC conversion module and the second output end of the energy storage module.

[0228] The charging unit 802 is further configured to, when the DC conversion module is in the positive-polarity working state, in response to a first control signal sent by the control module, control the first switch and the second switch to be in the off state; when the DC conversion module is in the reverse-polarity working state, in response to a second control signal sent by the control module, control the first switch and the second switch to be in the on state.

[0229] In some embodiments, when it is detected that the integrated charging and energy storage device establishes a communication connection with the device to be charged, the determination unit 802 is further configured to determine whether the device to be charged has a vehicle-to-grid (V2G) demand according to the charging demand information of the device to be charged; the charging unit 802 is further configured to, when the device to be charged has a V2G demand, in response to the V2G demand of the device to be charged, control the integrated charging and energy storage device to enter a first working mode; wherein, the first working mode is used to control the device to be charged to feed electrical energy to the external power grid.

[0230] In some embodiments, the determination unit 801 is further configured to, when the device to be charged does not have a V2G demand, determine whether the energy storage module meets a first preset condition according to the power supply energy information of the energy storage module; the charging unit 802 is further configured to, when the energy storage module meets the first preset condition, control the integrated charging and energy storage device to enter a second working mode; wherein, the second working mode is used to control the external power and the energy storage module to jointly charge the device to be charged; when the energy storage module does not meet the first preset condition, control the integrated charging and energy storage device to enter a third working mode; wherein, the third working mode is used to control the external power to charge the device to be charged.

[0231] In some embodiments, the integrated charging and energy storage device further includes a third switch and a fourth switch. The third switch is connected in series between the first output terminal of the DC conversion module and the second output terminal of the energy storage module, and the fourth switch is connected in series between the second input terminal of the DC conversion module and the second input terminal of the charging module. The charging unit 802 is further configured to, when the integrated charging and energy storage device is in the first working mode, in response to a third control signal sent by the control module, control the first switch and the fourth switch to be in the conducting state and the second switch and the third switch to be in the off state; when the integrated charging and energy storage device is in the second working mode, in response to a fourth control signal sent by the control module, control the third switch to be in the conducting state and the first switch, the second switch, and the fourth switch to be in the off state; when the integrated charging and energy storage device is in the third working mode, in response to a fifth control signal sent by the control module, control the first switch and the fourth switch to be in the conducting state and the second switch and the third switch to be in the off state.

[0232] In some embodiments, when it is detected that the integrated charging and energy storage device fails to establish a communication connection with the device to be charged, the charging unit 802 is further configured to, when it is determined that the power supply load of the external power is greater than a preset load threshold, control the integrated charging and energy storage device to enter a fourth working mode; wherein, the fourth working mode is used to control the energy storage module to feed back electric energy to the external power.

[0233] In some embodiments, the integrated charging and energy storage device further includes a fifth switch and a sixth switch. The fifth switch is connected in series between the second output terminal of the DC conversion module and the second input terminal of the charging module, and the sixth switch is connected in series between the first output terminal of the energy storage module and the first input terminal of the charging module. The charging unit 802 is further configured to, when the integrated charging and energy storage device is in the fourth working mode, in response to a sixth control signal sent by the control module, control the first switch and the second switch to be in the conducting state and the third switch, the fourth switch, the fifth switch, and the sixth switch to be in the off state.

[0234] In some embodiments, when it is detected that the integrated charging and energy storage device fails to establish a communication connection with the device to be charged, the determining unit 801 is further configured to determine whether the energy storage module meets a second preset condition according to the power supply capacity information of the energy storage module; the charging unit 802 is further configured to, when the energy storage module does not meet the second preset condition, control the integrated charging and energy storage device to enter a fifth working mode; wherein, the fifth working mode is used to control the external power to charge the energy storage module.

[0235] In some embodiments, the charging unit 802 is further configured to, when the integrated charging and energy storage device is in the fifth working mode, in response to a seventh control signal sent by the control module, control the first switch and the second switch to be in the conducting state and the third switch, the fourth switch, the fifth switch, and the sixth switch to be in the off state.

[0236] In some embodiments, the charging unit 802 is further configured to stop the power flow among the energy storage module, the device to be charged, and the external power when it is detected that the operating mode of the integrated energy storage and charging device meets the preset mode stop condition or the integrated energy storage and charging device meets the charging cut-off condition.

[0237] In a possible implementation, the charging control device 80 may be located in the control module of the integrated energy storage and charging device. Here, the control module may be located inside or outside the integrated energy storage and charging device, and no specific limitation is imposed thereon; if the control module is located inside the integrated energy storage and charging device, then the control module may be integrated inside the integrated energy storage and charging device; if the control module is located outside the integrated energy storage and charging device, then the control module and the integrated energy storage and charging device are separately arranged, that is, they are independent components.

[0238] In yet another embodiment of the present application, Figure 9 is a schematic structural diagram of a charging system provided by an embodiment of the present application. As Figure 9 shown, the charging system 90 includes a device to be charged 202 and the integrated energy storage and charging device 10 in the foregoing embodiment; wherein, the integrated energy storage and charging device 10 includes the charging control device 80 described in any one of the foregoing embodiments.

[0239] In an embodiment of the present application, the integrated energy storage and charging device 10 may be disposed in a charging pile. Correspondingly, the charging system includes a charging pile and a device to be charged 202. Here, the charging control device 80 in the integrated energy storage and charging device 10 controls the integrated energy storage and charging device 10 to charge the device to be charged 202. Here, the device to be charged 202 may be a new energy vehicle, such as an electric vehicle, etc.

[0240] The embodiment of the present application provides a charging system. Since the charging system includes a charging control device, according to the operating state of the DC conversion module, the charging power output by the DC conversion module and the charging power provided by the energy storage module are jointly provided to the charging module, so that the charging power output by the charging module has a wider input range than the external power, and the flexibility of the charging power output by the charging module can be improved, so that the range of the charging power is larger, thereby enabling voltage adaptation with a variety of devices to be charged, expanding the applicable range of the integrated energy storage and charging device, and improving the charging efficiency.

[0241] It can be understood that in this embodiment, the "unit" may be a part of a circuit, a part of a processor, a part of a program or software, etc. Of course, it may also be a module or non-modular. Moreover, the components in this embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software function module.

[0242] In this embodiment, when the integrated unit is implemented in the form of a software functional module and is not sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in this embodiment. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0243] The embodiment of the present application provides a computer-readable storage medium storing a computer program, and when the computer program is executed by at least one processor, it implements the steps of the charging control method described in any one of the foregoing embodiments.

[0244] The embodiment of the present application also provides a computer program product, including a computer program or instruction, and when the computer program or instruction is executed, it implements the steps of the method described in any one of the foregoing embodiments.

[0245] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a device, a device, or a computer program product. Therefore, the present application can adopt the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories and optical memories, etc.) containing computer-usable program codes.

[0246] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0247] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one or more processes and / or blocks Figure 1 in one process or multiple processes and / or blocks Figure 1 in one block or multiple blocks.

[0248] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one or more processes and / or blocks Figure 1 in one process or multiple processes and / or blocks Figure 1 in one block or multiple blocks.

[0249] It should be noted that in this application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, product or apparatus including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, product or apparatus. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, product or apparatus including such element.

[0250] The serial numbers of the embodiments of the present application described above are only for description and do not represent the superiority or inferiority of the embodiments.

[0251] The methods disclosed in several method embodiments provided by the present application can be arbitrarily combined without conflict to obtain new method embodiments.

[0252] The features disclosed in several product embodiments provided by the present application can be arbitrarily combined without conflict to obtain new product embodiments.

[0253] The features disclosed in several method or device embodiments provided by the present application can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0254] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered by the protection scope of the present application.

Claims

1. A charging control method, characterized in that: The charging control method comprises: Determine the charging demand information of the device to be charged, the first charging power output by the DC conversion module in the storage-charging integrated device, and the second charging power output by the energy storage module; Determine the working state of the DC conversion module according to the first charging power, the second charging power and the charging demand information; wherein the working state includes a positive polarity working state and a reverse polarity working state; According to the working state of the DC conversion module, control the charging module in the storage-charging integrated device to charge the device to be charged; Among them, the integrated storage and charging device includes the energy storage module, the DC conversion module and the charging module, the DC conversion module is configured to convert the input external power into the first charging power, and the DC conversion module, the energy storage module and the charging module are connected in series so that the charging module can provide the required charging power to the device to be charged.

2. The charging control method according to claim 1, characterized in that: According to the working state of the DC conversion module, controlling the charging module in the storage-charging integrated device to charge the device to be charged includes: When the DC conversion module is in a positive polarity working state, the first charging power output by the DC conversion module and the second charging power output by the energy storage module are provided to the charging module, and the third charging power output by the charging module is used to charge the device to be charged; or, When the DC conversion module is in the reverse polarity working state, the first charging power output by the DC conversion module is fed back to the energy storage module, and the fourth charging power output by the energy storage module is provided to the charging module, and the fifth charging power output by the charging module is used to charge the device to be charged.

3. The charging control method according to claim 2, characterized in that: The integrated storage and charging device further includes a first switch and a second switch, and the charging control method further includes: When the DC conversion module is in a positive polarity working state, in response to a first control signal sent by the control module, the first switch and the second switch are controlled to be in a disconnected state; When the DC conversion module is in a reverse polarity working state, in response to a second control signal sent by the control module, the first switch and the second switch are controlled to be in a conducting state; The first switch is connected in series between the first input end of the DC conversion module and the first output end of the energy storage module, and the second switch is connected in series between the second input end of the DC conversion module and the second output end of the energy storage module.

4. The charging control method according to claim 3, characterized in that: In the case where it is detected that the integrated storage and charging device establishes a communication connection with the device to be charged, the charging control method further includes: Determining whether the device to be charged has a vehicle-to-grid (V2G) demand according to the charging demand information of the device to be charged; When the device to be charged has a V2G demand, in response to the V2G demand of the device to be charged, the integrated storage and charging device is controlled to enter a first working mode; wherein the first working mode is used to control the device to be charged to feed back electrical energy to the external power.

5. The charging control method according to claim 4, characterized in that: The charging control method further includes: When the device to be charged does not have a V2G requirement, determining whether the energy storage module meets a first preset condition according to the power supply capability information of the energy storage module; When the energy storage module meets the first preset condition, the storage-charging integrated device is controlled to enter a second working mode; wherein the second working mode is used to control the external power and the energy storage module to jointly charge the device to be charged; When the energy storage module does not meet the first preset condition, the integrated storage and charging device is controlled to enter a third working mode; wherein the third working mode is used to control the external power to charge the device to be charged.

6. The charging control method according to claim 5, characterized in that: The integrated storage and charging device further includes a third switch and a fourth switch, and the charging control method further includes: When the integrated storage and charging device is in the first working mode, in response to a third control signal sent by the control module, the first switch and the fourth switch are controlled to be in the on state and the second switch and the third switch are controlled to be in the off state; When the storage-charging integrated device is in the second working mode, in response to a fourth control signal sent by the control module, the third switch is controlled to be in an on state and the first switch, the second switch and the fourth switch are controlled to be in an off state, or the first switch, the second switch and the third switch are controlled to be in an on state and the fourth switch is controlled to be in an off state; When the storage-charging integrated device is in the third working mode, in response to a fifth control signal sent by the control module, the first switch and the fourth switch are controlled to be in the on state and the second switch and the third switch are controlled to be in the off state; The third switch is connected in series between the first output end of the DC conversion module and the second output end of the energy storage module, and the fourth switch is connected in series between the second input end of the DC conversion module and the second output end of the DC conversion module.

7. The charging control method according to claim 6, characterized in that: When it is detected that the integrated storage-charging device has not established a communication connection with the device to be charged, the charging control method further includes: When it is determined that the power supply load of the external power is greater than a preset load threshold, the integrated storage and charging device is controlled to enter a fourth working mode; wherein the fourth working mode is used to control the energy storage module to feed back electric energy to the external power.

8. The charging control method according to claim 7, characterized in that: The integrated storage and charging device further includes a fifth switch and a sixth switch, and the charging control method further includes: When the integrated storage and charging device is in the fourth working mode, in response to a sixth control signal sent by the control module, the first switch and the second switch are controlled to be in the on state and the third switch, the fourth switch, the fifth switch and the sixth switch are controlled to be in the off state; The fifth switch is connected in series between the second output end of the DC conversion module and the second input end of the charging module, and the sixth switch is connected in series between the first output end of the energy storage module and the first input end of the charging module.

9. The charging control method according to claim 8, characterized in that: In the case where it is detected that the integrated storage and charging device has not established a communication connection with the device to be charged, the charging control method further includes: Determining whether the energy storage module meets a second preset condition according to the power supply capacity information of the energy storage module; When the energy storage module does not meet the second preset condition, the integrated storage and charging device is controlled to enter a fifth working mode; wherein the fifth working mode is used to control the external power to charge the energy storage module.

10. The charging control method according to claim 9, characterized in that: The charging control method further includes: When the integrated storage and charging device is in the fifth working mode, in response to the seventh control signal sent by the control module, the first switch and the second switch are controlled to be in the on state and the third switch, the fourth switch, the fifth switch and the sixth switch are in the off state.

11. The charging control method according to any one of claims 1 to 10, characterized in that: The charging control method further includes: When it is detected that the working mode of the integrated storage and charging device meets the preset mode stop condition or the integrated storage and charging device meets the charging cut-off condition, the flow of electric energy between the energy storage module, the device to be charged and the external power is stopped.

12. A charging control device, characterized in that: The charging control device comprises a determining unit and a charging unit, wherein: The determination unit is configured to determine the charging demand information of the device to be charged, the first charging power output by the DC conversion module in the storage-charging integrated device, and the second charging power output by the energy storage module; according to the first charging power, the second charging power and the charging demand information, determine the working state of the DC conversion module; wherein the working state includes a positive polarity working state and a reverse polarity working state; The charging unit is configured to control the charging module in the storage-charging integrated device to charge the device to be charged according to the working state of the DC conversion module; Among them, the integrated storage and charging device includes an energy storage module, a DC conversion module and a charging module. The DC conversion module is configured to convert the input external power into the first charging power, and the DC conversion module, the energy storage module and the charging module are connected in series so that the charging module can provide the required charging power to the device to be charged.

13. A charging system, characterized in that: The charging system includes a device to be charged and an integrated storage and charging device; wherein the integrated storage and charging device includes the charging control device as described in claim 12.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the method according to any one of claims 1 to 11 is implemented.

Images